1. Add water in pan.
2. Add sugar, tea leaves and spices.
3. Bring to boil and simmer for a minute or so.
4. Add milk.
5. Bring to boil and simmer for 3-5 minutes.
6. Strain tea in teapot.

To make chai for one person, one needs:

1 cup of water, see 1. above.
1 teaspoon of sugar, 1 teaspoon of tea leaves and 1/4
teaspoon of
spices, see 2. above. (depending on how sweet, strong and
spicy)
1/4 cup of milk, see 4. above. (depending on how milky)